Add a reminder when contributor is new to ping all contributor bot

.github/workflows/new-contributor.yml

@@ -0,0 +1,45 @@
+name: New Contributor Action
+on: 
+    pull_request_target:
+        types: [closed]
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+    cancel-in-progress: true
+
+jobs:
+  check-new-contributor:
+    if: ${{ github.event.pull_request.merged }}
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Check new contributor
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const prAuthor = context.payload.pull_request.user.login;
+            const prMerger = context.payload.pull_request.merged_by.login;
+            const repoOwner = context.repo.owner;
+            const repoName = context.repo.repo;
+            const currentPR = context.payload.pull_request.number;
+            const previouslyMergedPRsByAuthor = await github.paginate(
+              github.rest.pulls.list,
+              {
+                owner: repoOwner,
+                repo: repoName,
+                state: 'closed',
+                per_page: 100
+              },
+              (response) => response.data.filter(pr => pr.merged_at != null && pr.user.login === prAuthor && pr.number !== currentPR)
+            );
+            if (previouslyMergedPRsByAuthor.length == 0) {
+              const welcomeMessage = `**Welcome**, @${prAuthor}! 🎉 Thank you for your contribution to the MarkBind project!\n\n@${prMerger}, please remember to add @${prAuthor} as an official contributor to our repository.\n\nSee the full list of contributors [here](https://markbind.org/about.html). ✨`;
+              github.rest.issues.createComment({
+                issue_number: currentPR,
+                owner: repoOwner,
+                repo: repoName,
+                body: welcomeMessage
+              });
+            }
+